Mathematics (AS & A Level) · Oct / Nov 2023 · Paper 61 · Question 7
9709
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A biologist wishes to test whether the mean concentration , in suitable units, of a certain pollutant in a river is below the permitted level of 0.5. She measures the concentration, x, of the pollutant at 50 randomly chosen locations in the river. The results are summarised below. n = 50 Σx = 23.0 Σx2 = 13.02
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7(a)[7]
7(b)[5]
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